Problem:

I’m working on a Flask application that allows users to input and execute Python code in real-time using SocketIO. but facing Error: ‘NoneType’ object is not subscriptable this error.

ide.py

from flask import Flask, render_template
from flask_socketio import SocketIO, emit
import sys
from io import StringIO

app = Flask(__name__)
socketio = SocketIO(app)

variables = {}

@app.route("https://stackoverflow.com/")
def index():
    return render_template('index.html')

@socketio.on('run_code')
def run_code(data):
    code = data['code']
    
    original_stdout = sys.stdout
    sys.stdout = StringIO()

    try:
        lines = code.strip().split('\n')
        for line in lines:
            exec_globals = {'__builtins__': None}
            exec_locals = variables
            exec(line, exec_globals, exec_locals)
            result = sys.stdout.getvalue().strip()
            emit('code_result', {'output': result})
            # Reset stdout for the next iteration
            sys.stdout = StringIO()
    except Exception as e:
        error_message = str(e)
        emit('code_result', {'error': error_message})
    finally:
        sys.stdout = original_stdout

if __name__ == '__main__':
    socketio.run(app, debug=True)  

facing this error one flask webpage
or is there any easy way?